Umar ibn Abd al-Aziz (Arabic: عمر بن عبد العزيز‎, romanized: ʿUmar ibn ʿAbd al-ʿAzīz; 2 November 682 – c. 5 February 720), commonly known as Umar II (عمر الثاني), was the eighth Umayyad caliph. He made various significant contributions and reforms to the society, and he has been described as "the most pious and devout" of the Umayyad rulers and was often called the first Mujaddid and sixth righteous caliph of Islam.